<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div class="continner">
        <div class="header"></div>
        <div class="main">
            <div class="left">
                <ul>
                    <li>苹果</li>
                    <li>香蕉</li>
                    <li>橘子</li>
                </ul>
            </div>
            <div class="right"></div>
        </div>
        <div class="footer"></div>

    </div>
</body>
<style type="text/css">
    * {
        margin: 0;
        padding: 0;
    }

    ul,
    li {
        list-style: none;
    }

    .header {
        width: 100%;
        height: 60px;
        background-color: red;
    }

    .main {
        display: flex;

    }

    .left {
        width: 76px;
    position: absolute;
    height: 100%;
        background-color: blue;
    }
    li{
        height: 40px;
        text-align: center;
        line-height: 40px;
    }
</style>

</html>